patch 9.1.0984: exception handling can be improved

Problem:  exception handling can be improved
Solution: add v:stacktrace and getstacktrace()

closes: #16360

Co-authored-by: Naruhiko Nishino <naru123456789@gmail.com>
Signed-off-by: ichizok <gclient.gaap@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/Make_all.mak b/src/testdir/Make_all.mak
index 7285354..13f4830 100644
--- a/src/testdir/Make_all.mak
+++ b/src/testdir/Make_all.mak
@@ -292,6 +292,7 @@
 	test_spell_utf8 \
 	test_spellfile \
 	test_spellrare \
+	test_stacktrace \
 	test_startup \
 	test_startup_utf8 \
 	test_stat \
@@ -545,6 +546,7 @@
 	test_spell_utf8.res \
 	test_spellfile.res \
 	test_spellrare.res \
+	test_stacktrace.res \
 	test_startup.res \
 	test_stat.res \
 	test_statusline.res \